1201577541 has 4 divisors (see below), whose sum is σ = 1602103392. Its totient is φ = 801051692.

The previous prime is 1201577521. The next prime is 1201577549. The reversal of 1201577541 is 1457751021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1457751021 = 3 ⋅485917007.

It is a cyclic number.

It is not a de Polignac number, because 1201577541 - 2⁷ = 1201577413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201577549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200262921 + ... + 200262926.

It is an arithmetic number, because the mean of its divisors is an integer number (400525848).

Almost surely, 2^1201577541 is an apocalyptic number.

It is an amenable number.

1201577541 is a deficient number, since it is larger than the sum of its proper divisors (400525851).

1201577541 is an equidigital number, since it uses as much as digits as its factorization.

1201577541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400525850.

The product of its (nonzero) digits is 9800, while the sum is 33.

The square root of 1201577541 is about 34663.7785159091. The cubic root of 1201577541 is about 1063.1240284590.

The spelling of 1201577541 in words is "one billion, two hundred one million, five hundred seventy-seven thousand, five hundred forty-one".